A portable device is disclosed that includes a charge control circuit configured to control charging of a secondary battery included in a battery pack, the secondary battery being configured to supply power to the portable device; a temperature detection terminal at which the temperature of the secondary battery is detected from a temperature detection part of the battery pack; positive and negative power terminals to be connected to the battery pack; a control circuit configured to control the operation of the portable device; and an interface circuit connected between the temperature detection terminal and each of an input terminal of the charge control circuit and an input terminal of the control circuit, in which a signal detected at the temperature detection terminal is fed to each of the charge control circuit and the control circuit through the interface circuit.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A portable device, comprising: a charge control circuit configured to control charging of a secondary battery included in a battery pack, the secondary battery being configured to supply power to the portable device; a temperature detection terminal at which a temperature of the secondary battery from a temperature detection part of the battery pack is detected; positive and negative power terminals to be connected to the battery pack; a control circuit configured to control an operation of the portable device; and an interface circuit including a peak-hold circuit and a level-shift circuit connected in parallel to the temperature detection terminal, the peak-hold circuit having an output terminal thereof connected to an input terminal of the charge control circuit and the level-shift circuit having an output terminal thereof connected to an input terminal of the control circuit, wherein a signal detected at the temperature detection terminal is directly input to each of the peak-hold circuit and the level-shift circuit of the interface circuit to be fed to each of the charge control circuit and the control circuit through the interface circuit.
2. A portable device, comprising: a charge control circuit configured to control charging of a secondary battery included in a battery pack, the secondary battery being configured to supply power to the portable device; a temperature detection terminal at which a temperature of the secondary battery from a temperature detection part of the battery pack is detected; positive and negative power terminals to be connected to the battery pack; a control circuit configured to control an operation of the portable device; and an interface circuit connected between the temperature detection terminal and each of an input terminal of the charge control circuit and an input terminal of the control circuit, wherein a signal detected at the temperature detection terminal is input to the interface circuit to be fed to each of the charge control circuit and the control circuit through the interface circuit, the interface circuit includes a peak-hold circuit to which the signal detected at the temperature detection terminal is input, an output terminal of the peak-hold circuit is connected to the input terminal of the charge control circuit, and the peak-hold circuit is configured to compare a pulse width of the signal detected at the temperature detection terminal and a pulse width of a reference signal and to hold a peak value of the signal detected at the temperature detection terminal in response to the pulse width of the signal detected at the temperature detection terminal being less than the pulse width of the reference signal.
3. The portable device according to claim 1 , wherein: the level-shift circuit is configured to change a level of the signal detected at the temperature detection terminal.
4. The portable device according to claim 1 , further comprising: a battery pack including: a first external terminal connected to the temperature detection terminal; second and third external terminals connected to the positive and negative power terminals, respectively, of the portable device; a secondary battery connected between the second external terminal and the third external terminal; a status detection circuit connected between the second external terminal and the third external terminal and configured to detect a status of the secondary battery; a thermistor connected between the first external terminal and the third external terminal; and a level-shift circuit connected between the first external terminal and an output terminal of the status detection circuit and configured to change a voltage level of an output signal of the status detection circuit.
5. A battery pack, comprising: a first external terminal to be connected to a temperature detection terminal of a portable device; second and third external terminals to be connected to positive and negative power terminals, respectively, of the portable device; a secondary battery connected between the second external terminal and the third external terminal; a status detection circuit connected between the second external terminal and the third external terminal and configured to detect a status of the secondary battery and output a pulse signal communicating information on the status of the secondary battery; a thermistor connected between the first external terminal and the third external terminal, the thermistor being disposed in a vicinity of the secondary battery to be thermally coupled with the secondary battery; and a level-shift circuit connected between the first external terminal and an output terminal of the status detection circuit and configured to change a voltage level of the output pulse signal of the status detection circuit, wherein the output pulse signal of the status detection circuit is input to the first external terminal through the level-shift circuit, and a voltage at the first external terminal indicates information on a temperature of the secondary battery and the information communicated by the output pulse signal of the status detection circuit.
6. The portable device according to claim 1 , wherein: the peak-hold circuit holds a peak value of the signal detected at the temperature detection terminal in response to a pulse width of the signal detected at the temperature detection terminal being less than a predetermined width.
7. A battery pack for the portable device as set forth in claim 1 , the battery pack comprising: a first external terminal to be connected to the temperature detection terminal of the portable device; second and third external terminals to be connected to the positive and negative power terminals, respectively, of the portable device; the secondary battery connected between the second external terminal and the third external terminal; a status detection circuit connected between the second external terminal and the third external terminal and configured to detect a status of the secondary battery and output a pulse signal communicating information on the status of the secondary battery; a thermistor connected between the first external terminal and the third external terminal; and a level-shift circuit connected between the first external terminal and an output terminal of the status detection circuit and configured to change a voltage level of the output pulse signal of the status detection circuit, wherein the output pulse signal of the status detection circuit is input to the first external terminal through the level-shift circuit, and a voltage at the first external terminal indicates information on the temperature of the secondary battery and the information communicated by the output pulse signal of the status detection circuit.
8. A battery pack for the portable device as set forth in claim 2 , the battery pack comprising: a first external terminal to be connected to the temperature detection terminal of the portable device; second and third external terminals to be connected to the positive and negative power terminals, respectively, of the portable device; the secondary battery connected between the second external terminal and the third external terminal; a status detection circuit connected between the second external terminal and the third external terminal and configured to detect a status of the secondary battery and output a pulse signal communicating information on the status of the secondary battery; a thermistor connected between the first external terminal and the third external terminal; and a level-shift circuit connected between the first external terminal and an output terminal of the status detection circuit and configured to change a voltage level of the output pulse signal of the status detection circuit, wherein the output pulse signal of the status detection circuit is input to the first external terminal through the level-shift circuit, and a voltage at the first external terminal indicates information on the temperature of the secondary battery and the information communicated by the output pulse signal of the status detection circuit.
9. The battery pack as claimed in claim 5 , wherein the thermistor has a first end connected to the third external terminal and has a second end connected between an output of the level-shift circuit and the first external terminal.
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December 15, 2008
December 25, 2012
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